Biosorption of Manganese by Amended Aspergillus versicolor from Polluted Water Sources
2020
A.H. El Maghrabi, M.A. Marzouk, M.A. Elbably and M.E.M. Hassouna
This study deals with the adsorption capacity of the powder of Aspergillus versicolor (Ascomycota) as a bioadsorbent for the removal of manganese ion from polluted water samples. The effect of various experimental parameters such as the effect of pH, quantity of the fungus powder, contact time with the manganese (II) ion solution and its concentration on the biosorption capacity was conducted to optimize them. Potato Dextrose Agar (PDA) plates amended with 100 ppm of Mn(II) ions were used for growing the fungus isolates and standard spread plate method was applied. The plates were incubated at 27°C for 4 to 7 days, then the grown fungi were killed by adding 0.5 N NaOH, washed with doubly distilled water, dried out in hot air oven and finally ground into a very fine powder. The results verify that the optimum pH value for manganese biosorption was 6. The rate of adsorption of manganese by Aspergillus versicolor was very fast reaching a maximum within 15 min at 31°C. Maximum removal efficiency occurred on the use of 0.3 g A. versicolor powder. The maximum metal uptake was relatively observed at 90 ppm manganese concentration. Manganese removal process decreased with increasing metal concentration. The desorption study showed that manganese was recovered up to 81.53% using 0.1 N HCl rendering the possibility of the adsorbent regeneration. Experimental results have been analysed using a Langmuir and Freundlich adsorption isotherm models. Surface morphology study of A. versicolor powder using SEM analysis, assured its irregular surface nature.
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